Certain group of bacteria are referred to as methanogens as they produce methane gas as a metabolic by-product in hypoxic environment.
Two characteristics of methanogens are:
a) These are strictly unicellular anaerobes.
b) They are extremophiles and can survive in extremes of conditions.
c) They produce methane gas as metabolic by-product.
A few examples of methanogens are: Methanosaeta concilii and Methanopyrus kandleri.
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